Regarding Exchange/Linux/LDAP

SUSE Openexchange Under GPL
Real-life review of why MS Exchange sucks.

Exchange Functionality for Linux

Migrating from Exchange to OSER

Export contacts from Exchange server to LDAP

eMailman(sm) -- Conversion

Connecting POP And IMAP Clients To MS Exchange Server

Plugins:

ZideStore Server / ZideLook Outlook Plugin